The first three years of the series, Buffy Summers and the Scoobies (i.e. best friends Willow, Xander, Cordelia and more) dealt with "high-school-as-hell" in a more literal sense than most television shows -- especially since the school was located on a hellmouth portal.

Luckily for Sunnydale, Buffy is a slayer with super strength and a mystical purpose to save the world. The prophecies don't much mention dealing with high school boys, snotty schoolmates, homework and graduation -- but with the help of her Watcher/librarian/friend Giles, Buffy conquered all, even her own death.

Well, graduation did end with Buffy and friends helping to blow up a giant demon and fight off a horde of vampires in their cap-and-gowns before going off to college -- so there was that.